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Share-Based Compensation - Summary of Share-based Compensation Expense (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]      
Option awards $ 23,393 $ 18,423 $ 23,876
Other share-based awards 28,513 28,844 23,368
Total share-based compensation before tax 51,906 47,267 47,244
Tax benefit 12,354 17,555 17,546
Total share-based compensation expense included in net income $ 39,552 $ 29,712 $ 29,698